Предмет: Английский язык, автор: cacuke007

4 Choose the correct verb forms

1 Tom doesn't go out / isn't going out tonight because he has to study.
2 I can't answer the phone! I have / I'm having a shower!
3 Always check for cars before you cross / are crossing the road.
4 Sorry, he can't talk to you now. He drives / He's driving the car.
5 He likes food, but he never cooks / he's never cooking!
6 How often do you eat / are you eating fish?
7 Can you phone back later? I prepare / I'm preparing dinner at the moment.
8 Quick, turn left! That blue car follows / is following us!
9 My mother often buys / is buying meat for the weekend.
10 Just a moment! I look / I'm looking for my keys.

Ответы

Автор ответа: pil2003

1 Tom isn't going out tonight because he has to study.

2 I can't answer the phone! I'm having a shower!

3 Always check for cars before you cross the road.

4 Sorry, he can't talk to you now. He's driving the car.

5 He likes food, but he never cooks!

6 How often do you eat fish?

7 Can you phone back later? I'm preparing dinner at the moment.

8 Quick, turn left! That blue car is following us!

9 My mother often buys meat for the weekend.

10 Just a moment! I'm looking for my keys.

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Предмет: Английский язык, автор: ZaicevaN

Слова к тексту «Metals in the Service of Man”.

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12. refining n очистка
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14. treat v обрабатывать
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Прочитайте текст “Metals in the Service of Man”. Выполните следующие задания:

1. Скажите, какую роль играют металлы в жизни человека.
2. Найдите в тексте случаи употребления страдательного залога.

METALS IN THE SERVICE OF MAN

Let us consider why metals play such a great role in man’s activities. Wood and stone are both older in use, yet to a considerable extent they have been replaced by metals. In spite of the great progress of chemistry and increasing output of plastic materials metals are still used for most of machines, structures and instruments. If there were no metals, no railway, airplane, car, electric motor, turbine or pipeline could operate.
The reason for the increased use of metals is to be found in their characteristic properties. The most important of these properties is their strength or ability to support weight without bending or breaking. Resistance to atmospheric destruction, plasticity and the ability to be formed into desired shapes are remarkable as well. Some metals have also special properties – two of which are the ability to conduct electric current and the ability to be magnetized.
Nowadays we know that over three quarters of existing elements are metals. We know approximately over 80 metals and several thousand alloys.
Most metals are usually found in nature as minerals or ores, where they exist in chemical combinations with other substances. Metallic ores contain metals combined with oxygen, sulphur or other metals.
Ores are usually mined and passed to the metallurgist for refining and purification. The ores are treated by fire or chemically by the process called smelting. Ores have to pass through this very complicated process before pure metals are obtained.
But pure metals are comparatively seldom used because they are rather expensive and their strength is generally insufficient for the purposes of to-day. The most important way in which the strength of metals can be increased is alloying. Alloys are the most important engineering materials. Alloys are obtained by adding various metals or non-metals to the main metallic element.

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